ogr_kml

ogr_kml.ipynb

{
 "cells": [
  {
   "cell_type": "code",
   "execution_count": 1,
   "metadata": {
    "collapsed": false
   },
   "outputs": [
    {
     "data": {
      "text/plain": [
       "'2010100'"
      ]
     },
     "execution_count": 1,
     "metadata": {},
     "output_type": "execute_result"
    }
   ],
   "source": [
    "import ogr\n",
    "import gdal\n",
    "import os\n",
    "\n",
    "gdal.VersionInfo()"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 2,
   "metadata": {
    "collapsed": false
   },
   "outputs": [
    {
     "name": "stdout",
     "output_type": "stream",
     "text": [
      "D:\\\n"
     ]
    }
   ],
   "source": [
    "%cd D:\\\\"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 3,
   "metadata": {
    "collapsed": false
   },
   "outputs": [],
   "source": [
    "def getnames(infile):\n",
    "\n",
    "    layers = []\n",
    "\n",
    "    ds = ogr.Open(infile)\n",
    "\n",
    "    for i in range(ds.GetLayerCount()):\n",
    "\n",
    "        lyr = ds.GetLayer(i)\n",
    "        layers.append(lyr.GetName())\n",
    "\n",
    "    ds = None\n",
    "    \n",
    "    return layers"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 4,
   "metadata": {
    "collapsed": false
   },
   "outputs": [
    {
     "name": "stdout",
     "output_type": "stream",
     "text": [
      "26\n"
     ]
    }
   ],
   "source": [
    "infile = 'doc.kml'\n",
    "layers = getnames(infile)\n",
    "\n",
    "print(len(layers))"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 5,
   "metadata": {
    "collapsed": false
   },
   "outputs": [
    {
     "data": {
      "text/plain": [
       "(False, False)"
      ]
     },
     "execution_count": 5,
     "metadata": {},
     "output_type": "execute_result"
    }
   ],
   "source": [
    "outfile1 = 'doc1.geojson'\n",
    "outfile2 = 'doc2.geojson'\n",
    "\n",
    "os.path.exists(outfile1), os.path.exists(outfile2)"
   ]
  },
  {
   "cell_type": "markdown",
   "metadata": {},
   "source": [
    "## Doesnt work:"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 6,
   "metadata": {
    "collapsed": false
   },
   "outputs": [
    {
     "data": {
      "text/plain": [
       "<osgeo.gdal.Dataset; proxy of <Swig Object of type 'GDALDatasetShadow *' at 0x0000000004773D50> >"
      ]
     },
     "execution_count": 6,
     "metadata": {},
     "output_type": "execute_result"
    }
   ],
   "source": [
    "res = gdal.VectorTranslate(outfile1, infile, format='GeoJSON', accessMode='append', layers=layers, layerName='outlayer')\n",
    "res"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 7,
   "metadata": {
    "collapsed": false
   },
   "outputs": [],
   "source": [
    "res = None"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 8,
   "metadata": {
    "collapsed": false
   },
   "outputs": [
    {
     "name": "stdout",
     "output_type": "stream",
     "text": [
      "None\n"
     ]
    }
   ],
   "source": [
    "print(ogr.Open(outfile1)) # file is also 'in use' in Explorer, res = None doesnt release handle?"
   ]
  },
  {
   "cell_type": "raw",
   "metadata": {},
   "source": [
    "Console shows:\n",
    "\"ERROR 1: GeoJSON parsing error: unexpected end of data (at offset 937626)\n",
    "ERROR 4: Failed to read GeoJSON data\"\n",
    "\n",
    "Which is the missing ']}' at the end of the file, all features/geometries are in the file."
   ]
  },
  {
   "cell_type": "markdown",
   "metadata": {},
   "source": [
    "## Works:"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 9,
   "metadata": {
    "collapsed": false
   },
   "outputs": [],
   "source": [
    "res = gdal.VectorTranslate(outfile2, infile, format='GeoJSON', accessMode='append', layers=layers, layerName='outlayer')\n",
    "res = None"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 10,
   "metadata": {
    "collapsed": false
   },
   "outputs": [
    {
     "name": "stdout",
     "output_type": "stream",
     "text": [
      "<osgeo.ogr.DataSource; proxy of <Swig Object of type 'OGRDataSourceShadow *' at 0x00000000047DBD50> >\n"
     ]
    }
   ],
   "source": [
    "print(ogr.Open(outfile2))"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": null,
   "metadata": {
    "collapsed": true
   },
   "outputs": [],
   "source": []
  }
 ],
 "metadata": {
  "anaconda-cloud": {},
  "kernelspec": {
   "display_name": "Python [default]",
   "language": "python",
   "name": "python3"
  },
  "language_info": {
   "codemirror_mode": {
    "name": "ipython",
    "version": 3
   },
   "file_extension": ".py",
   "mimetype": "text/x-python",
   "name": "python",
   "nbconvert_exporter": "python",
   "pygments_lexer": "ipython3",
   "version": "3.4.5"
  }
 },
 "nbformat": 4,
 "nbformat_minor": 0
}